The mineral vital for oxygen transport in the blood is iron. Iron is a key component of hemoglobin, the protein in red blood cells responsible for carrying oxygen from the lungs to the body's tissues. Adequate iron levels are crucial for maintaining energy levels and preventing conditions such as anemia. Iron can be obtained from dietary sources such as red meat, legumes, and leafy green vegetables. However, it is important to balance iron intake with other nutrients to sustain overall health.